Optical imaging lens

ABSTRACT

An optical imaging lens may include eight lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the eight lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics while the total length of the optical imaging lens may be shortened.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/918,239 titled “Optical Imaging Lens,” filed on Mar. 12, 2018.

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having at least eight lenselements.

BACKGROUND

Technology improves every day, continuously expanding consumer demandfor increasingly compact electronic devices. As a result, key componentsof optical imaging lenses that are incorporated into consumer electronicproducts should keep pace with technological improvements in order tomeet the expectations of consumers. Some important characteristics of anoptical imaging lens include image quality and size. There may also bedemands for bigger apertures and field of views. As image sensortechnology improves, consumers' expectations related to image qualityare also raised. Accordingly, in addition to reducing the size of theimaging lens, achieving good optical characteristics and performanceshould be considered.

Decreasing the dimensions of an optical lens while maintaining goodoptical performance might not be achieved simply by scaling down thelens. Rather, these benefits may be realized by improving other aspectsof the design process, such as by varying the material used for the lensor adjusting the assembly yield.

Technological improvements of optical lens may include eliminatingchromatic aberrations and dispersions by adding a certain number ofoptical lenses to meet consumer demand for image quality. However, thedistance from the object-side surface of the first lens element to imageplane along the optical axis becomes larger with an increased number ofoptical lenses. The increased number of optical lenses may bedisadvantageous for designing thinner mobile phones, digital cameras,and automotive lens. Achieving an optical imaging lens with high imagequality and small size is thus desired.

SUMMARY

The present disclosure provides an optical imaging lens for capturingimages and videos such as the optical imaging lens of cell phones,cameras, tablets, car lenses and personal digital assistants. Bycontrolling the convex or concave shape of the surfaces of eight lenselements, the length of the optical imaging lens may be shortened whilemaintaining good optical characteristics.

In the specification, parameters used herein may include:

Parameter Definition T1 A thickness of the first lens element along theoptical axis G12 A distance between the image-side surface of the firstlens element and the object-side surface of the second lens elementalong the optical axis, i.e., an air gap between the first lens elementand the second lens element along the optical axis T2 A thickness of thesecond lens element along the optical axis G23 A distance between theimage-side surface of the second lens element and the object-sidesurface of the third lens element along the optical axis, i.e., an airgap between the second lens element and the third lens element along theoptical axis T3 A thickness of the third lens element along the opticalaxis G34 A distance between the image-side surface of the third lenselement and the object-side surface of the fourth lens element along theoptical axis, i.e., an air gap between the third lens element and thefourth lens element along the optical axis T4 A thickness of the fourthlens element along the optical axis G45 A distance between theimage-side surface of the fourth lens element and the object-sidesurface of the fifth lens element along the optical axis, i.e., an airgap between the fourth lens element and the fifth lens element along theoptical axis T5 A thickness of the fifth lens element along the opticalaxis G56 A distance between the image-side surface of the fifth lenselement and the object-side surface of the sixth lens element along theoptical axis, i.e., an air gap between the fifth lens element and thesixth lens element along the optical axis T6 A thickness of the sixthlens element along the optical axis G67 A distance between theimage-side surface of the sixth lens element and the object-side surfaceof the seventh lens element along the optical axis, i.e., an air gapbetween the sixth lens element and the seventh lens element along theoptical axis T7 A thickness of the seventh lens element along theoptical axis G78 A distance between the image-side surface of theseventh lens element and the object-side surface of the eighth lenselement along the optical axis, i.e., an air gap between the seventhlens element and the eighth lens element along the optical axis T8 Athickness of the eighth lens element along the optical axis G8F Adistance between the image-side surface of the eighth lens element andthe object-side surface of the filtering unit along the optical axis,i.e., an air gap between the eighth lens element and the filtering unitalong the optical axis TF A thickness of the filtering unit along theoptical axis GFP A distance between the image-side surface of thefiltering unit and the image plane along the optical axis, i.e., an airgap between the filtering unit and the image plane along the opticalaxis f1 A focal length of the first lens element f2 A focal length ofthe second lens element f3 A focal length of the third lens element f4 Afocal length of the fourth lens element f5 A focal length of the fifthlens element f6 A focal length of the sixth lens element f7 A focallength of the seventh lens element f8 A focal length of the eighth lenselement n1 A refractive index of the first lens element n2 A refractiveindex of the second lens element n3 A refractive index of the third lenselement n4 A refractive index of the fourth lens element n5 A refractiveindex of the fifth lens element n6 A refractive index of the sixth lenselement n7 A refractive index of the seventh lens element n8 Arefractive index of the eighth lens element V1 An Abbe number of thefirst lens element V2 An Abbe number of the second lens element V3 AnAbbe number of the third lens element V4 An Abbe number of the fourthlens element V5 An Abbe number of the fifth lens element V6 An Abbenumber of the sixth lens element V7 An Abbe number of the seventh lenselement V8 An Abbe number of the eighth lens element HFOV Half Field ofView of the optical imaging lens Fno F-number of the optical imaginglens EFL An effective focal length of the optical imaging lens TTL Adistance from the object-side surface of the first lens element to theimage plane along the optical axis, i.e., the length of the opticalimage lens ALT A sum of the thicknesses of eight lens elements from thefirst lens element to the eighth lens element along the optical axis,i.e., a sum of the thicknesses of the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element, the sixth lens element, the seventh lens element, andeighth lens element along the optical axis AAG A sum of the seven airgaps from the first lens element to the eighth lens element along theoptical axis, i.e., a sum of the a distance between the first lenselement and the second lens element along the optical axis, a distancebetween the second lens element and the third lens element along theoptical axis, a distance between the third lens element and the fourthlens element along the optical axis, a distance between the fourth lenselement and the fifth lens element along the optical axis, a distancebetween the fifth lens element and the sixth lens element along theoptical axis, a distance between the sixth lens element and the seventhlens element along the optical axis, and a distance between the seventhlens element and the eighth lens element along the optical axis BFL Aback focal length of the optical imaging lens, i.e., a distance from theimage- side surface of the eighth lens element to the image plane alongthe optical axis TL A distance from the object-side surface of the firstlens element to the image-side surface of the eighth lens element alongthe optical axis

According to some embodiments of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element, a sixth lens element, a seventh lens element, and aneighth lens element sequentially from an object side to an image sidealong an optical axis. The first lens element to the eighth lens elementmay each comprise an object-side surface facing toward the object sideand allowing imaging rays to pass through and an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough, an optical axis region of the image-side surface of the firstlens element may be concave, and the second lens element may havenegative refracting power. A periphery region of the object-side surfaceof the fifth lens element may be concave and an optical axis region ofthe image-side surface of the fifth lens element may be convex, anoptical axis region of the image-side surface of the sixth lens elementmay be concave, and an optical axis region of the image-side surface ofthe seventh lens element may be concave. The material of the third lenselement, the fourth lens element, and the eighth lens element may beplastic, and the optical imaging lens may comprise no other lenseshaving refracting power beyond the eight lens elements.

In another exemplary embodiment, some Inequalities could be taken intoconsideration as follows:ALT/(T1+G23)≤5.000  Inequality (1);AAG/(T1+T5)≤2.500  Inequality (2);(T7+T8)/T6≤3.300  Inequality (3);(T4+G45+T5)/G34≥1.500  Inequality (4);EFL/(T6+T7)≥3.900  Inequality (5);TL/BFL≤5.500  Inequality (6);(T6+G67+T7+G78+T8)/(T1+G12+T2)≤2.200  Inequality (7);(T3+G34)/(T2+G23)≤2.800  Inequality (8);(T1+G12)/(T5+G56)≤2.200  Inequality (9);T1/T8≥1.200  Inequality (10);TTL/ALT≤2.200  Inequality (11);AAG/(G12+G34)≥2.000  Inequality (12);T1/(G12+T2)≥1.300  Inequality (13);(T3+T5)/T4≥2.500  Inequality (14);(T6+T7)/T2≤3.800  Inequality (15);EFL/AAG≥2.200  Inequality (16);(G34+G45)/G23≤4.000  Inequality (17);(T1+T3)/G34≥1.500  Inequality (18); andALT/AAG≥1.600  Inequality (19).

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appendeddrawings, in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to one embodiment of the present disclosure;

FIG. 2 depicts a schematic view of a relation between a surface shapeand an optical focus of a lens element;

FIG. 3 depicts a schematic view of a first example of a surface shapeand an effective radius of a lens element;

FIG. 4 depicts a schematic view of a second example of a surface shapeand an effective radius of a lens element;

FIG. 5 depicts a schematic view of a third example of a surface shapeand an effective radius of a lens element;

FIG. 6 depicts a cross-sectional view of an embodiment of an opticalimaging lens having eight lens elements according to one embodiment ofthe present disclosure;

FIG. 7 depicts a chart of a a longitudinal spherical aberration andother kinds of optical aberrations of an embodiment of an opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of anoptical imaging lens of an embodiment of the present disclosure;

FIG. 9 depicts a table of aspherical data of an embodiment of an opticalimaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of an optical imaginglens according to one embodiment of the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of anoptical imaging lens of another embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of an optical imaginglens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of another embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of an optical imaginglens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of anoptical imaging lens of another embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of another embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 39 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 43 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 45 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 46 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 47 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 48 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 49 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 50 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 51 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 52 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 53 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 54 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 55 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 56 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 57 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure;

FIG. 58 depicts a cross-sectional view of another embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 59 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of another embodiment of the opticalimaging lens according to the present disclosure;

FIG. 60 depicts a table of optical data for each lens element of anotherembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 61 depicts a table of aspherical data of another embodiment of theoptical imaging lens according to the present disclosure; and

FIG. 62A and FIG. 62B are tables for the values of T1, G12, T2, G23, T3,G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG, ALT,BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG as determined in specific example embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentdisclosure. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the disclosure. In this respect, as used herein, theterm “in” may include “in” and “on”, and the terms “a”, “an” and “the”may include singular and plural references. Furthermore, as used herein,the term “by” may also mean “from”, depending on the context.Furthermore, as used herein, the term “if” may also mean “when” or“upon”, depending on the context. Furthermore, as used herein, the words“and/or” may refer to and encompass any and all possible combinations ofone or more of the associated listed items.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1 ). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1 , a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4 ), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2 , optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2 . Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2 . Accordingly, sincethe extension line EL of the ray intersects the optical axis I on theobject side A1 of the lens element 200, periphery region Z2 is concave.In the lens element 200 illustrated in FIG. 2 , the first transitionpoint TP1 is the border of the optical axis region and the peripheryregion, i.e., TP1 is the point at which the shape changes from convex toconcave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex- (concave-) region,” can be usedalternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3 , only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3 , since the shape of the optical axisregion Z1 is concave, the shape of the periphery region Z2 will beconvex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4 , a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4 , theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5 , the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics and a shortened length.Reference is now made to FIGS. 6-9 . FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 1′ having eight lenselements according to a first example embodiment. FIG. 7 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 1′ according to the firstexample embodiment. FIG. 8 illustrates an example table of optical dataof each lens element of the optical imaging lens 1′ according to thefirst example embodiment. FIG. 9 depicts an example table of asphericaldata of the optical imaging lens 1′ according to the first exampleembodiment.

As shown in FIG. 6 , the optical imaging lens 1′ of the presentembodiment may comprise, in order from an object side A1 to an imageside A2 along an optical axis, an aperture stop 1′00, a first lenselement 1′10, a second lens element 1′20, a third lens element 1′30, afourth lens element 1′40, a fifth lens element 1′50, a sixth lenselement 1′60, a seventh lens element 1′70 and an eighth lens element1′80. A filtering unit 1′90 and an image plane 1′93 of an image sensor(not shown) are positioned at the image side A2 of the optical imaginglens P. Each of the first, second, third, fourth, fifth, sixth, seventhand eighth lens elements 1′10, 1′20, 1′30, 1′40, 1′50, 1′60, 1′70, 1′80and the filtering unit 1′90 may comprise an object-side surface1′11/1′21/1′31/1′41/1′51/1′61/1′71/1′81/1′91 facing toward the objectside A1 and an image-side surface1′12/1′22/1′32/1′42/1′52/1′62/1′72/1′82/1′92 facing toward the imageside A2. The example embodiment of the filtering unit 1′90 illustratedmay be an IR cut filter (infrared cut filter) positioned between theeighth lens element 1′80 and the image plane 1′93. The filtering unit1′90 selectively absorbs light passing optical imaging lens 1′ that hasa specific wavelength. For example, if IR light is absorbed, IR lightwhich may not be seen by human eyes may be prohibited from producing animage on the image plane 1′93.

Exemplary embodiments of each lens element of the optical imaging lens1′ will now be described with reference to the drawings. The lenselements 1′10, 1′20, 1′30, 1′40, 1′50, 1′60, 1′70, 1′80 of the opticalimaging lens 1′ may be constructed using plastic materials in thisembodiment.

An example embodiment of the first lens element 1′10 may have positiverefracting power. The optical axis region 1111 and the periphery region1112 of the object-side surface 1′11 of the first lens element 1′10 maybe convex. The optical axis region 1121 and the periphery region 1122 ofthe image-side surface 1′12 of the first lens element 1′10 may beconcave.

An example embodiment of the second lens element 1′20 may have negativerefracting power. The optical axis region 1211 and the periphery region1212 of the object-side surface 1′21 of the second lens element 1′20 maybe convex. The optical axis region 1221 and the periphery region 1222 ofthe image-side surface 1′22 of the second lens element 1′20 may beconcave.

An example embodiment of the third lens element 1′30 may have positiverefracting power. The optical axis region 1311 of the object-sidesurface 1′31 of the third lens element 1′30 may be convex. The peripheryregion 1312 of the object-side surface 1′31 of the third lens element1′30 may be concave. The optical axis region 1321 of the image-sidesurface 1′32 of the third lens element 1′30 may be concave. Theperiphery region 1322 of the image-side surface 1′32 of the third lenselement 1′30 may be convex.

An example embodiment of the fourth lens element 1′40 may have negativerefracting power. The optical axis region 1411 of the object-sidesurface 1′41 of the fourth lens element 1′40 may be convex. Theperiphery region 1412 of the object-side surface 1′41 of the fourth lenselement 1′40 may be concave. The optical axis region 1421 of theimage-side surface 1′42 of the fourth lens element 1′40 may be concave.The periphery region 1422 of the image-side surface 1′42 of the fourthlens element 1′40 may be convex.

An example embodiment of the fifth lens element 1′50 may have positiverefracting power. The optical axis region 1511 and the periphery region1512 of the object-side surface 1′51 of the fifth lens element 1′50 maybe concave. The optical axis region 1521 and the periphery region 1522of the image-side surface 1′52 of the fifth lens element 1′50 may beconvex.

An example embodiment of the sixth lens element 1′60 may have negativerefracting power. The optical axis region 1611 of the object-sidesurface 1′61 of the sixth lens element 1′60 may be convex. The peripheryregion 1612 of the object-side surface 1′61 of the sixth lens element1′60 may be concave. The optical axis region 1621 of the image-sidesurface 1′62 of the sixth lens element 1′60 may be concave. Theperiphery region 1622 of the image-side surface 1′62 of the sixth lenselement 1′60 may be convex.

An example embodiment of the seventh lens element 1′70 may have positiverefracting power. The optical axis region 1711 and the periphery region1712 of the object-side surface 1′71 of the seventh lens element 1′70may be convex. The optical axis region 1721 of the image-side surface1′72 of the seventh lens element 1′70 may be concave. The peripheryregion 1722 of the image-side surface 1′72 of the seventh lens element1′70 may be convex.

An example embodiment of the eighth lens element 1′80 may have negativerefracting power. The optical axis region 1811 and the periphery region1812 of the object-side surface 1′81 of the eighth lens element 1′80 maybe concave. The optical axis region 1821 of the image-side surface 1′82of the eight lens element 1′80 may be concave. The periphery region 1822of the image-side surface 1′82 of the eighth lens element 1′80 may beconvex.

The aspherical surfaces including the object-side surface 1′11 and theimage-side surface 1′12 of the first lens element 1′10, the object-sidesurface 1′21 and the image-side surface 1′22 of the second lens element1′20, the object-side surface 1′31 and the image-side surface 1′32 ofthe third lens element 1′30, the object-side surface 1′41 and theimage-side surface 1′42 of the fourth lens element 1′40, the object-sidesurface 1′51 and the image-side surface 1′52 of the fifth lens element1′50, the object-side surface 1′61 and the image-side surface 1′62 ofthe sixth lens element 1′60, the object-side surface 1′71 and theimage-side surface 1′72 of the seventh lens element 1′70, and theobject-side surface 1′81 and the image-side surface 1′82 of the eighthlens element 1′80 may all be defined by the following aspherical formula(1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}\mspace{14mu}(1)}\end{matrix}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9 .

FIG. 7(a) shows the a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), wherein thehorizontal axis of FIG. 7(a) defines the focus, and wherein the verticalaxis of FIG. 7(a) defines the field of view. FIG. 7(b) shows the fieldcurvature aberration in the sagittal direction for three representativewavelengths (470 nm, 555 nm, 650 nm), wherein the horizontal axis ofFIG. 7(b) defines the focus, and wherein the vertical axis of FIG. 7(b)defines the image height. FIG. 7(c) shows the field curvature aberrationin the tangential direction for three representative wavelengths (470nm, 555 nm, 650 nm), wherein the horizontal axis of FIG. 7(c) definesthe focus, and wherein the vertical axis of FIG. 7(c) defines the imageheight. FIG. 7(d) shows a variation of the distortion aberration,wherein the horizontal axis of FIG. 7(d) defines the percentage, andwherein the vertical axis of FIG. 7(d) defines the image height. Thethree curves with different wavelengths (470 nm, 555 nm, 650 nm) mayrepresent that off-axis light with respect to these wavelengths may befocused around an image point. From the vertical deviation of each curveshown in FIG. 7(a), the offset of the off-axis light relative to theimage point may be within about ±0.025 mm. Therefore, the firstembodiment may improve the longitudinal spherical aberration withrespect to different wavelengths. Referring to FIG. 7(b), the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field may fall within about ±0.03 mm. Referringto FIG. 7(c), and the focus variation with respect to the threedifferent wavelengths (470 nm, 555 nm, 650 nm) in the whole field mayfall within about ±0.07 mm. Referring to FIG. 7(d), the horizontal axisof FIG. 7(d), the variation of the distortion aberration may be withinabout ±1.2%.

The distance from the object-side surface 1′11 of the first lens element1′10 to the image plane 1′93 along the optical axis (TTL) may be about5.308 mm, Fno may be about 1.6, and HFOV may be about 37.043 degrees. Inaccordance with these values, the present embodiment may provide anoptical imaging lens having a shortened length while improving opticalperformance.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

Reference is now made to FIGS. 10-13 . FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2′ having eight lenselements according to a second example embodiment. FIG. 11 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 2′ according to the secondexample embodiment. FIG. 12 shows an example table of optical data ofeach lens element of the optical imaging lens 2′ according to the secondexample embodiment. FIG. 13 shows an example table of aspherical data ofthe optical imaging lens 2′ according to the second example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers may be initialed with 2 or 2′; for example, referencenumber 2′31 may label the object-side surface of the third lens element2′30, reference number 2′32 may label the image-side surface of thethird lens element 2′30, etc.

As shown in FIG. 10 , the optical imaging lens 2′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 2′00, a first lenselement 2′10, a second lens element 2′20, a third lens element 2′30, afourth lens element 2′40, a fifth lens element 2′50, a sixth lenselement 2′60, a seventh lens element 2′70 and an eighth lens element2′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 2′11, 2′21, 2′31, 2′41, 2′51, 2′61, 2′71, and2′81 and the image-side surfaces 2′22, 2′32, 2′42, 2′52, 2′62, and 2′82may be generally similar to the optical imaging lens 1′, but thedifferences between the optical imaging lens 1′ and the optical imaginglens 2′ may include the concave or concave surface structures of theimage-side surfaces 2′12 and 2′72. Additional differences may include aradius of curvature, a refracting power, a thickness, aspherical data,and/or an effective focal length of each lens element. Morespecifically, the periphery region 2122 of the image-side surface 2′12of the first lens element 2′10 may be convex, and the periphery region2722 of the image-side surface 2′72 of the seventh lens element 2′70 maybe concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 12 for the opticalcharacteristics of each lens element in the optical imaging lens 2′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 11(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.012 mm. Referring to FIG. 11(b), and the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 11(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.06 mm.Referring to FIG. 11(d), the variation of the distortion aberration ofthe optical imaging lens 2′ may be within about ±0.35%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and thedistortion aberration in the second embodiment may be smaller. Moreover,this embodiment may have a larger value of HFOV.

Reference is now made to FIGS. 14-17 . FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3′ having eight lenselements according to a third example embodiment. FIG. 15 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 3′ according to the thirdexample embodiment. FIG. 16 shows an example table of optical data ofeach lens element of the optical imaging lens 3′ according to the thirdexample embodiment. FIG. 17 shows an example table of aspherical data ofthe optical imaging lens 3′ according to the third example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers may be initialed with 3 or 3′; for example, referencenumber 3′31 may label the object-side surface of the third lens element3′30, reference number 3′32 may label the image-side surface of thethird lens element 3′30, etc.

As shown in FIG. 14 , the optical imaging lens 3′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 3′00, a first lenselement 3′10, a second lens element 3′20, a third lens element 3′30, afourth lens element 3′40, a fifth lens element 3′50, a sixth lenselement 3′60, a seventh lens element 3′70 and an eighth lens element3′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 3′11, 3′21, 3′31, 3′41, 3′51, 3′61, and 3′71and the image-side surfaces 3′12, 3′22, 3′32, 3′42, 3′52, 3′62, and 3′82may be generally similar to the optical imaging lens 1′, but thedifferences between the optical imaging lens 1′ and the optical imaginglens 3′ may include the concave or concave surface structures of theobject-side surface 3′81 and the image-side surface 3′72. Additionaldifferences may include a radius of curvature, a refracting power, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the periphery region 3722 of theimage-side surface 3′72 of the seventh lens element 3′70 may be concave,and the periphery region 3812 of the object-side surface 3′81 of theeighth lens element 3′80 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 16 for the opticalcharacteristics of each lens element in the optical imaging lens 3′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 15(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.012 mm. Referring to FIG. 15(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.035 mm. Referring to FIG.15(c), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.05 mm. Referring to FIG. 15(d), the variation of the distortionaberration of the optical imaging lens 3′ may be within about ±0.14%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the tangential direction,and/or the distortion aberration in the third embodiment may be smaller.Moreover, this embodiment may be manufactured more easily and the yieldrate may be higher compared to the first embodiment.

Reference is now made to FIGS. 18-21 . FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4′ having eight lenselements according to a fourth example embodiment. FIG. 19 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 4′ according to the fourthexample embodiment. FIG. 20 shows an example table of optical data ofeach lens element of the optical imaging lens 4′ according to the fourthexample embodiment. FIG. 21 shows an example table of aspherical data ofthe optical imaging lens 4′ according to the fourth example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers may be initialed with 4 or 4′; for example, referencenumber 4′31 may label the object-side surface of the third lens element4′30, reference number 4′32 may label the image-side surface of thethird lens element 4′30, etc.

As shown in FIG. 18 , the optical imaging lens 4′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 4′00, a first lenselement 4′10, a second lens element 4′20, a third lens element 4′30, afourth lens element 4′40, a fifth lens element 4′50, a sixth lenselement 4′60, a seventh lens element 4′70 and an eighth lens element4′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 4′11, 4′21, 4′31, 4′41, 4′51, 4′61, and 4′71and the image-side surfaces 4′12, 4′22, 4′32, 4′42, 4′52, 4′62, and 4′82may be generally similar to the optical imaging lens 1′, but thedifferences between the optical imaging lens 1′ and the optical imaginglens 4′ may include the concave or concave surface structures of theobject-side surface 4′81 and the image-side surface 4′72. Additionaldifferences may include a radius of curvature, a refracting power, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the periphery region 4722 of theimage-side surface 4′72 of the seventh lens element 4′70 may be concave,and the periphery region 4812 of the object-side surface 4′81 of theeighth lens element 4′80 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 20 for the opticalcharacteristics of each lens element in the optical imaging lens 4′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 19(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.013 mm. Referring to FIG. 19(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 19(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.035 mm.Referring to FIG. 19(d), the variation of the distortion aberration ofthe optical imaging lens 4′ may be within about ±0.4%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and/or thedistortion aberration in the fourth embodiment may be smaller.

Reference is now made to FIGS. 22-25 . FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5′ having eight lenselements according to a fifth example embodiment. FIG. 23 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 5′ according to the fifthexample embodiment. FIG. 24 shows an example table of optical data ofeach lens element of the optical imaging lens 5′ according to the fifthexample embodiment. FIG. 25 shows an example table of aspherical data ofthe optical imaging lens 5′ according to the fifth example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers may be initialed with 5 or 5′; for example, referencenumber 5′31 may label the object-side surface of the third lens element5′30, reference number 5′32 may label the image-side surface of thethird lens element 5′30, etc.

As shown in FIG. 22 , the optical imaging lens 5′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 5′00, a first lenselement 5′10, a second lens element 5′20, a third lens element 5′30, afourth lens element 5′40, a fifth lens element 5′50, a sixth lenselement 5′60, a seventh lens element 5′70 and an eighth lens element5′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 5′11, 5′31, 5′41, 5′51, and 5′61 and theimage-side surfaces 5′12, 5′22, 5′32, 5′52, 5′62, 5′72, and 5′82 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 5′ mayinclude the concave or concave surface structures of the object-sidesurfaces 5′21, 5′71, 5′81 and the image-side surface 5′42. Additionaldifferences may include a radius of curvature, a refracting power, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the sixth lens element 5′60 may havepositive refracting power, the periphery region 5212 of the object-sidesurface 5′21 of the second lens element 5′20 may be concave, theperiphery region 5422 of the image-side surface 5′42 of the fourth lenselement 5′40 may be concave, the periphery region 5712 of object-sidesurface 5′71 of the seventh lens element 5′70 may be concave, and theperiphery region 5812 of the object-side surface 5′81 of the eighth lenselement 5′80 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens element in the optical imaging lens 5′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 23(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.014 mm. Referring to FIG. 23(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.3 mm. Referring to FIG. 23(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.9 mm.Referring to FIG. 23(d), the variation of the distortion aberration ofthe optical imaging lens 5′ may be within about ±0.8%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration and the distortion aberration in the fifth embodiment may besmaller. Moreover, this embodiment may be manufactured more easily andthe yield rate may be higher compared to the first embodiment.

Reference is now made to FIGS. 26-29 . FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having eight lenselements according to a sixth example embodiment. FIG. 27 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 28 shows an example table of optical data of each lenselement of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 29 shows an example table of aspherical data of theoptical imaging lens 6 according to the sixth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers may be initialed with 6; for example, reference number631 may label the object-side surface of the third lens element 630,reference number 632 may label the image-side surface of the third lenselement 630, etc.

As shown in FIG. 26 , the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 600, a first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640, a fifth lens element 650, a sixth lens element 660, aseventh lens element 670 and an eighth lens element 680.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 611, 621, 641, 651, 661, and 671 and theimage-side surfaces 612, 622, 632, 642, 652, 662, 672, and 682 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 6 mayinclude the concave or concave surface structures of the object-sidesurfaces 631, and 681. Additional differences may include a radius ofcurvature, a refracting power, a thickness, aspherical data, and/or aneffective focal length of each lens element. More specifically, theperiphery region 6312 of the object-side surface 631 of the third lenselement 630 may be convex, and the periphery region 6812 of object-sidesurface 681 of the eighth lens element 680 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 28 for the opticalcharacteristics of each lens element in the optical imaging lens 6 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 27(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.016 mm. Referring to FIG. 27(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 27(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.03 mm.Referring to FIG. 27(d), the variation of the distortion aberration ofthe optical imaging lens 6 may be within about ±1%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and/or thedistortion aberration in the sixth embodiment may be smaller.

Reference is now made to FIGS. 30-33 . FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having eight lenselements according to a seventh example embodiment. FIG. 31 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 7 according to theseventh example embodiment. FIG. 32 shows an example table of opticaldata of each lens element of the optical imaging lens 7 according to theseventh example embodiment. FIG. 33 shows an example table of asphericaldata of the optical imaging lens 7 according to the seventh exampleembodiment. The reference numbers labeled in the present embodiment maybe similar to those in the first embodiment for the similar elements,but here the reference numbers may be initialed with 7; for example,reference number 731 may label the object-side surface of the third lenselement 730, reference number 732 may label the image-side surface ofthe third lens element 730, etc.

As shown in FIG. 26 , the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 700, a first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740, a fifth lens element 750, a sixth lens element 760, aseventh lens element 770 and an eighth lens element 780.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 711, 731, 741, 751, 761, and 781 and theimage-side surfaces 712, 722, 732, 742, 752, 762, 772, and 782 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 7 mayinclude the concave or concave surface structures of the object-sidesurfaces 721, and 771. Additional differences may include a radius ofcurvature, a refracting power, a thickness, aspherical data, and/or aneffective focal length of each lens element. More specifically, theperiphery region 7212 of the object-side surface 721 of the second lenselement 720 may be concave, and the periphery region 7712 of object-sidesurface 771 of the seventh lens element 770 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 32 for the opticalcharacteristics of each lens element in the optical imaging lens 7 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 31(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.035 mm. Referring to FIG. 31(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.04 mm. Referring to FIG. 31(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.14 mm.Referring to FIG. 31(d), the variation of the distortion aberration ofthe optical imaging lens 7 may be within about ±2%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the seventh embodiment may bemanufactured more easily and the yield rate may be higher.

Reference is now made to FIGS. 34-37 . FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having eight lenselements according to an eighth example embodiment. FIG. 35 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 8 according to theeighth example embodiment. FIG. 36 shows an example table of opticaldata of each lens element of the optical imaging lens 8 according to theeighth example embodiment. FIG. 37 shows an example table of asphericaldata of the optical imaging lens 8 according to the eighth exampleembodiment. The reference numbers labeled in the present embodiment maybe similar to those in the first embodiment for the similar elements,but here the reference numbers may be initialed with 8; for example,reference number 831 may label the object-side surface of the third lenselement 830, reference number 832 may label the image-side surface ofthe third lens element 830, etc.

As shown in FIG. 34 , the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 800, a first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840, a fifth lens element 850, a sixth lens element 860, aseventh lens element 870 and an eighth lens element 880.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 811, 821, 831, 841, 851, 861, and 871 and theimage-side surfaces 822, 832, 842, 852, 862, 872, and 882 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 8 mayinclude the concave or concave surface structures of the object-sidesurface 881, and the image-side surface 812. Additional differences mayinclude a radius of curvature, a refracting power, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the periphery region 8122 of the image-side surface812 of the first lens element 810 may be convex, and the peripheryregion 8812 of object-side surface 881 of the eighth lens element 880may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 36 for the opticalcharacteristics of each lens element in the optical imaging lens 8 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 35(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.018 mm. Referring to FIG. 35(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 35(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.025 mm.Referring to FIG. 35(d), the variation of the distortion aberration ofthe optical imaging lens 8 may be within about ±1.4%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and/or thedistortion aberration in the eighth embodiment may be smaller.

Reference is now made to FIGS. 38-41 . FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having eight lenselements according to a ninth example embodiment. FIG. 39 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 40 shows an example table of optical data of each lenselement of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 41 shows an example table of aspherical data of theoptical imaging lens 9 according to the ninth example embodiment. Thereference numbers labeled in the present embodiment may be similar tothose in the first embodiment for the similar elements, but here thereference numbers may be initialed with 9; for example, reference number931 may label the object-side surface of the third lens element 930,reference number 932 may label the image-side surface of the third lenselement 930, etc.

As shown in FIG. 38 , the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 900, a first lens element910, a second lens element 920, a third lens element 930, a fourth lenselement 940, a fifth lens element 950, a sixth lens element 960, aseventh lens element 970 and an eighth lens element 980.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 911, 921, 931, 941, 951, 961, and 971 and theimage-side surfaces 912, 922, 932, 942, 952, 962, 972, and 982 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 9 mayinclude the concave or concave surface structures of the object-sidesurface 981. Additional differences may include a radius of curvature, arefracting power, a thickness, aspherical data, and/or an effectivefocal length of each lens element. More specifically, the peripheryregion 9812 of the object-side surface 981 of the eighth lens element980 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 40 for the opticalcharacteristics of each lens element in the optical imaging lens 9 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 39(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.015 mm. Referring to FIG. 39(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 39(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.06 mm.Referring to FIG. 39(d), the variation of the distortion aberration ofthe optical imaging lens 9 may be within about ±1%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and/or thedistortion aberration in the ninth embodiment may be smaller.

Reference is now made to FIGS. 42-45 . FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 having eight lenselements according to a tenth example embodiment. FIG. 43 shows examplecharts of a longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 10 according to the tenthexample embodiment. FIG. 44 shows an example table of optical data ofeach lens element of the optical imaging lens 10 according to the tenthexample embodiment. FIG. 45 shows an example table of aspherical data ofthe optical imaging lens 10 according to the tenth example embodiment.The reference numbers labeled in the present embodiment may be similarto those in the first embodiment for the similar elements, but here thereference numbers may be initialed with 10; for example, referencenumber 1031 may label the object-side surface of the third lens element1030, reference number 1032 may label the image-side surface of thethird lens element 1030, etc.

As shown in FIG. 42 , the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 1000, a first lenselement 1010, a second lens element 1020, a third lens element 1030, afourth lens element 1040, a fifth lens element 1050, a sixth lenselement 1060, a seventh lens element 1070 and an eighth lens element1080.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 1011, 1021, 1031, 1041, 1051, 1061, and 1071and the image-side surfaces 1022, 1032, 1042, 1052, and 1062 may begenerally similar to the optical imaging lens 1′, but the differencesbetween the optical imaging lens 1′ and the optical imaging lens 10 mayinclude the concave or concave surface structures of the object-sidesurface 1081 and the image-sides surfaces 1012, 1072, and 1082.Additional differences may include a radius of curvature, a refractingpower, a thickness, aspherical data, and/or an effective focal length ofeach lens element. More specifically, the periphery region 10122 of theimage-side surface 1012 of the first lens element 1010 may be convex,the periphery region 10722 of the image-side surface 1072 of the seventhlens element 1070 may be concave, the periphery region 10812 of theobject-side surface 1081 of the eighth lens element 1080 may be convex,and the periphery region 10822 of the image-side surface 1082 of theeighth lens element 1080 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 44 for the opticalcharacteristics of each lens element in the optical imaging lens 10 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 43(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.025 mm. Referring to FIG. 43(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.05 mm. Referring to FIG. 43(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.06 mm.Referring to FIG. 43(d), the variation of the distortion aberration ofthe optical imaging lens 10 may be within about ±2%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the field curvature aberrationin the tangential direction in the tenth embodiment may be smaller.

Reference is now made to FIGS. 46-49 . FIG. 46 illustrates an examplecross-sectional view of an optical imaging lens 11′ having eight lenselements according to an eleventh example embodiment. FIG. 47 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 11′ according to theeleventh example embodiment. FIG. 48 shows an example table of opticaldata of each lens element of the optical imaging lens 11′ according tothe eleventh example embodiment. FIG. 49 shows an example table ofaspherical data of the optical imaging lens 11′ according to theeleventh example embodiment. The reference numbers labeled in thepresent embodiment may be similar to those in the first embodiment forthe similar elements, but here the reference numbers may be initialedwith 11′; for example, reference number 11′31 may label the object-sidesurface of the third lens element 11′30, reference number 11′32 maylabel the image-side surface of the third lens element 11′30, etc.

As shown in FIG. 46 , the optical imaging lens 11′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 11′00, a first lenselement 11′10, a second lens element 11′20, a third lens element 11′30,a fourth lens element 11′40, a fifth lens element 11′50, a sixth lenselement 11′60, a seventh lens element 11′70 and an eighth lens element11′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 11′11, 11′21, 11′41, 11′51, 11′61, 11′71 and11′81 and the image-side surfaces 11′12, 11′22, 11′32, 11′42, 11′52,11′62 and 11′82 may be generally similar to the optical imaging lens 1′,but the differences between the optical imaging lens 1′ and the opticalimaging lens 11′ may include the concave or concave surface structuresof the object-side surface 11′31 and the image-side surface 11′72.Additional differences may include a radius of curvature, a refractingpower, a thickness, aspherical data, and/or an effective focal length ofeach lens element. More specifically, the periphery region 11′312 of theobject-side surface 11′31 of the third lens element 11′30 may be convex,and the periphery region 11′722 of the image-side surface 11′72 of theseventh lens element 11′70 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 48 for the opticalcharacteristics of each lens element in the optical imaging lens 11′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 47(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.025 mm. Referring to FIG. 47(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 47(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.12 mm.Referring to FIG. 47(d), the variation of the distortion aberration ofthe optical imaging lens 11′ may be within about ±2.5%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the field curvature aberrationin the sagittal direction in the eleventh embodiment may be smaller.

Reference is now made to FIGS. 50-53 . FIG. 50 illustrates an examplecross-sectional view of an optical imaging lens 12′ having eight lenselements according to a twelfth example embodiment. FIG. 51 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 12′ according to thetwelfth example embodiment. FIG. 52 shows an example table of opticaldata of each lens element of the optical imaging lens 12′ according tothe twelfth example embodiment. FIG. 53 shows an example table ofaspherical data of the optical imaging lens 12′ according to the twelfthexample embodiment. The reference numbers labeled in the presentembodiment may be similar to those in the first embodiment for thesimilar elements, but here the reference numbers may be initialed with12′; for example, reference number 12′31 may label the object-sidesurface of the third lens element 12′30, reference number 12′32 maylabel the image-side surface of the third lens element 12′30, etc.

As shown in FIG. 50 , the optical imaging lens 12′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 12′00, a first lenselement 12′10, a second lens element 12′20, a third lens element 12′30,a fourth lens element 12′40, a fifth lens element 12′50, a sixth lenselement 12′60, a seventh lens element 12′70 and an eighth lens element12′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 12′11, 12′21, 12′31, 12′41, 12′51, and 12′61and the image-side surfaces 12′12, 12′22, 12′32, 12′42, 12′52, 12′62 and12′82 may be generally similar to the optical imaging lens 1′, but thedifferences between the optical imaging lens 1′ and the optical imaginglens 12′ may include the concave or concave surface structures of theobject-side surfaces 12′71, 12′81 and the image-side surface 12′72.Additional differences may include a radius of curvature, a refractingpower, a thickness, aspherical data, and/or an effective focal length ofeach lens element. More specifically, the periphery region 12′712 of theobject-side surface 12′71 of the seventh lens element 12′70 may beconcave, the periphery region 12′722 of the image-side surface 12′72 ofthe seventh lens element 12′70 may be concave, and the periphery region12′812 of the object-side surface 12′81 of the eighth lens element 12′80may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 52 for the opticalcharacteristics of each lens element in the optical imaging lens 12′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 51(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.015 mm. Referring to FIG. 51(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 51(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.05 mm.Referring to FIG. 51(d), the variation of the distortion aberration ofthe optical imaging lens 12′ may be within about ±2%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,and/or the field curvature aberration in the tangential direction in thetwelfth embodiment may be smaller.

Reference is now made to FIGS. 54-57 . FIG. 54 illustrates an examplecross-sectional view of an optical imaging lens 13′ having eight lenselements according to a thirteenth example embodiment. FIG. 55 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 13′ according to thethirteenth example embodiment. FIG. 56 shows an example table of opticaldata of each lens element of the optical imaging lens 13′ according tothe thirteenth example embodiment. FIG. 57 shows an example table ofaspherical data of the optical imaging lens 13′ according to thethirteenth example embodiment. The reference numbers labeled in thepresent embodiment may be similar to those in the first embodiment forthe similar elements, but here the reference numbers may be initialedwith 13′; for example, reference number 13′31 may label the object-sidesurface of the third lens element 13′30, reference number 13′32 maylabel the image-side surface of the third lens element 13′30, etc.

As shown in FIG. 54 , the optical imaging lens 13′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 13′00, a first lenselement 13′10, a second lens element 13′20, a third lens element 13′30,a fourth lens element 13′40, a fifth lens element 13′50, a sixth lenselement 13′60, a seventh lens element 13′70 and an eighth lens element13′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 13′11, 13′21, 13′31, 13′41, 13′51, 13′61, 13′71and 13′81 and the image-side surfaces 13′12, 13′22, 13′32, 13′42, 13′52,13′62, 13′72 and 13′82 may be generally similar to the optical imaginglens 1′. Additional differences may include a radius of curvature, arefracting power, a thickness, aspherical data, and/or an effectivefocal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 56 for the opticalcharacteristics of each lens element in the optical imaging lens 13′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 55(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.012 mm. Referring to FIG. 55(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 55(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.05 mm.Referring to FIG. 55(d), the variation of the distortion aberration ofthe optical imaging lens 13′ may be within about ±1%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and/or thedistortion aberration in the thirteenth embodiment may be smaller.

Reference is now made to FIGS. 58-61 . FIG. 58 illustrates an examplecross-sectional view of an optical imaging lens 14′ having eight lenselements according to a fourteenth example embodiment. FIG. 59 showsexample charts of a longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 14′ according to thefourteenth example embodiment. FIG. 60 shows an example table of opticaldata of each lens element of the optical imaging lens 14′ according tothe fourteenth example embodiment. FIG. 61 shows an example table ofaspherical data of the optical imaging lens 14′ according to thefourteenth example embodiment. The reference numbers labeled in thepresent embodiment may be similar to those in the first embodiment forthe similar elements, but here the reference numbers may be initialedwith 14′; for example, reference number 14′31 may label the object-sidesurface of the third lens element 14′30, reference number 14′32 maylabel the image-side surface of the third lens element 14′30, etc.

As shown in FIG. 58 , the optical imaging lens 14′ of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 14′00, a first lenselement 14′10, a second lens element 14′20, a third lens element 14′30,a fourth lens element 14′40, a fifth lens element 14′50, a sixth lenselement 14′60, a seventh lens element 14′70 and an eighth lens element14′80.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 14′11, 14′21, 14′31, 14′41, 14′51, 14′61, 14′71and 14′81 and the image-side surfaces 14′12, 14′22, 14′32, 14′42, 14′52,14′62, 14′72 and 14′82 may be generally similar to the optical imaginglens P. Additional differences may include a radius of curvature, arefracting power, a thickness, aspherical data, and/or an effectivefocal length of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 60 for the opticalcharacteristics of each lens element in the optical imaging lens 14′ ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 59(a), theoffset of the off-axis light relative to the image point may be withinabout ±0.014 mm. Referring to FIG. 59(b), the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.02 mm. Referring to FIG. 59(c),the focus variation with respect to the three different wavelengths (470nm, 555 nm, 650 nm) in the whole field may fall within about ±0.09 mm.Referring to FIG. 59(d), the variation of the distortion aberration ofthe optical imaging lens 14′ may be within about ±1.2%.

Please refer to FIG. 62A and FIG. 62B for the values of T1, G12, T2,G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP, AAG,ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of the present embodiment.

In comparison with the first embodiment, the longitudinal sphericalaberration and/or the field curvature aberration in the sagittaldirection in the fourteenth embodiment may be smaller.

Please refer to FIG. 62A and FIG. 62B which show the values of T1, G12,T2, G23, T3, G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TF, GFP,AAG, ALT, BFL, TTL, TL, EFL, ALT/(T1+G23), AAG/(T1+T5), (T7+T8)/T6,(T4+G45+T5)/G34, EFL/(T6+T7), TL/BFL, (T6+G67+T7+G78+T8)/(T1+G12+T2),(T3+G34)/(T2+G23), (T1+G12)/(T5+G56), T1/T8, TTL/ALT, AAG/(G12+G34),T1/(G12+T2), (T3+T5)/T4, (T6+T7)/T2, EFL/AAG, (G34+G45)/G23, (T1+T3)/G34and ALT/AAG of all embodiments, and it may be clear that the opticalimaging lenses of any one of the fourteen embodiments may satisfy theEquations (1)-(19).

The optical imaging lens in each embodiment of the present disclosurewith the arrangements of the convex or concave surface structuresdescribed below may advantageously decrease the value of Fno: theoptical axis region of the image-side surface of the first lens elementmay be concave; the periphery region of the object-side surface of thefifth lens element may be concave; the optical axis region of theimage-side surface of the fifth lens element may be convex; the opticalaxis region the image-side surface of the sixth lens element may beconcave; the optical axis region of the image-side surface of theseventh lens element may be concave. This may advantageously adjustlongitudinal spherical aberrations and field curvature aberration, andreduce the distortion aberration. Moreover, the second lens elementhaving negative refracting power may advantageously increase the fieldof view.

To achieve a shortened length of lens system while maintaining imagequality, values of the air gap between lens elements or the thickness ofeach lens element may be shortened appropriately. To improve ease ofmanufacturing the optical imaging lens, an optical imaging lens of thepresent disclosure may also satisfy one or more of the inequalitiesbelow.

In some embodiment, an optical imaging lens may satisfyALT/(T1+G23)≤5.000; a preferable range may be 2.600≤ALT/(T1+G23)≤5.000.In some embodiment, an optical imaging lens may satisfyAAG/(T1+T5)≤2.500; a preferable range may be 0.400≤AAG/(T1+T5)≤2.500. Insome embodiment, an optical imaging lens may satisfy (T7+T8)/T6≤3.300; apreferable range may be 1.200≤(T7+T8)/T6≤3.300. In some embodiment, anoptical imaging lens may satisfy (T4+G45+T5)/G34≤1.500; a preferablerange may be 6.200≥(T4+G45+T5)/G34≥1.500. In some embodiment, an opticalimaging lens may satisfy EFL/(T6+T7)≥3.900; a preferable range may be8.000≥EFL/(T6+T7)≥3.900. In some embodiment, an optical imaging lens maysatisfy TL/BFL≤5.500; a preferable range may be 4.400≤TL/BFL≤5.500. Insome embodiment, an optical imaging lens may satisfy(T6+G67+T7+G78+T8)/(T1+G12+T2)≤2.200; a preferable range may be1.000≤(T6+G67+T7+G78+T8)/(T1+G12+T2)≤2.200. In some embodiment, anoptical imaging lens may satisfy (T3+G34)/(T2+G23)≤2.800; a preferablerange may be 1.600≤(T3+G34)/(T2+G23)≤2.800. In some embodiment, anoptical imaging lens may satisfy (T1+G12)/(T5+G56)≤2.200 a preferablerange may be 0.700≤(T1+G12)/(T5+G56)≤2.200. In some embodiment, anoptical imaging lens may satisfy T1/T8≥1.200; a preferable range may be3.300≥T1/T8≥1.200. In some embodiment, an optical imaging lens maysatisfy TTL/ALT≤2.200; a preferable range may be 1.300≤TTL/ALT≤2.200. Insome embodiment, an optical imaging lens may satisfyAAG/(G12+G34)≥2.000; a preferable range may be3.300≥AAG/(G12+G34)≥2.000. In some embodiment, an optical imaging lensmay satisfy T1/(G12+T2)≥1.300; a preferable range may be2.800≥T1/(G12+T2)≥1.300. In some embodiment, an optical imaging lens maysatisfy (T3+T5)/T4≥2.500; a preferable range may be7.000≥(T3+T5)/T4≥2.500. In some embodiment, an optical imaging lens maysatisfy (T6+T7)/T2≤3.800; a preferable range may be2.300≤(T6+T7)/T2≤3.800. In some embodiment, an optical imaging lens maysatisfy EFL/AAG≥2.200; a preferable range may be 4.700≥EFL/AAG≥2.200. Insome embodiment, an optical imaging lens may satisfy(G34+G45)/G23≤4.000; a preferable range may be1.600≤(G34+G45)/G23≤4.000. In some embodiment, an optical imaging lensmay satisfy (T1+T3)/G34≥1.500; a preferable range may be6.500≥(T1+T3)/G34≥1.500. In some embodiment, an optical imaging lens maysatisfy ALT/AAG≥1.600; a preferable range may be 4.700≥ALT/AAG≥1.600.

Any one of the aforementioned inequalities may be selectivelyincorporated in other inequalities to apply to the present embodiments,and as such are not limiting.

According to above disclosure, the longitudinal spherical aberration,the field curvature aberration and the variation of the distortionaberration of each embodiment may meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengthsmay be focused around an image point, and the offset of the off-axislight for each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, the fieldcurvature aberration and/or the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the 470 nm, 555 nm and 650 nmwavelengths may indicate that focusing ability and inhibiting abilityfor dispersion may be provided for different wavelengths.

In consideration of the non-predictability of the optical lens assembly,while the optical lens assembly may satisfy any one of inequalitiesdescribed above, the optical lens assembly herein according to thedisclosure may achieve a shortened length and smaller sphericalaberration, field curvature aberration, and/or distortion aberration,provide an enlarged field of view, increase an imaging quality and/orassembly yield, and/or effectively improve drawbacks of a typicaloptical lens assembly.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, the opticalimaging lens comprises no other lens elements having refracting powerbeyond the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements wherein: a periphery region of the image-sidesurface of the first lens element is concave; an optical axis region ofthe object-side surface of the third lens element is convex; a peripheryregion of the image-side surface of the third lens element is convex; anoptical axis region of the object-side surface of the fourth lenselement is convex; an optical axis region of the image-side surface ofthe fifth lens element is convex; a thickness of the first lens elementalong the optical axis is represented by T1; a thickness of the secondlens element along the optical axis is represented by T2; a thickness ofthe third lens element along the optical axis is represented by T3; athickness of the sixth lens element along the optical axis isrepresented by T6; a thickness of the seventh lens element along theoptical axis is represented by T7; a thickness of the eighth lenselement along the optical axis is represented by T8; a distance betweenthe image-side surface of the first lens element and the object-sidesurface of the second lens element along the optical axis is representedby G12; a distance between the image-side surface of the second lenselement and the object-side surface of the third lens element along theoptical axis is represented by G23; a distance between the image-sidesurface of the third lens element and the object-side surface of thefourth lens element along the optical axis is represented by G34; adistance between the image-side surface of the sixth lens element andthe object-side surface of the seventh lens element along the opticalaxis is represented by G67; a distance between the image-side surface ofthe seventh lens element and the object-side surface of the eighth lenselement along the optical axis is represented by G78; and the opticalimaging lens satisfies inequalities:(T7+T8)/T6≤3.300;(T6+G67+T7+G78+T8)/(T1+G12+T2)≤2.200; and(T3+G34)/(T2+G23)≤2.800.
 2. The optical imaging lens according to claim1, wherein a sum of thicknesses of the eight lens elements from thefirst lens element to the eighth lens element along the optical axis isrepresented by ALT, and the optical imaging lens further satisfies aninequality: ALT/(T1+G23)≤5.000.
 3. The optical imaging lens according toclaim 1, wherein a sum of seven air gaps from the first lens element tothe eighth lens elements along the optical axis is represented by AAG, athickness of the fifth lens element along the optical axis isrepresented by T5, and the optical imaging lens further satisfies aninequality: AAG/(T1+T5)≤2.500.
 4. The optical imaging lens according toclaim 1, wherein a thickness of the fourth lens element along theoptical axis is represented by T4, a distance between the image-sidesurface of the fourth lens element and the object-side surface of thefifth lens element along the optical axis is represented by G45, athickness of the fifth lens element along the optical axis isrepresented by T5, and the optical imaging lens further satisfies aninequality:(T4+G45+T5)/G34≥1.500.
 5. The optical imaging lens according to claim 1,wherein an effective focal length of the optical imaging lens isrepresented by EFL, and the optical imaging lens further satisfies aninequality: EFL/(T6+T7)≥3.900.
 6. The optical imaging lens according toclaim 1, wherein a thickness of the fifth lens element along the opticalaxis is represented by T5, a distance between the image-side surface ofthe fifth lens element and the object-side surface of the sixth lenselement along the optical axis is represented by G56, and the opticalimaging lens further satisfies an inequality:(T1+G12)/(T5+G56)≤2.200.
 7. The optical imaging lens according to claim1, wherein the optical imaging lens further satisfies an inequality:T1/T8 ≥1.200.
 8. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, the opticalimaging lens comprises no other lens elements having refracting powerbeyond the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements wherein: an optical axis region of the image-sidesurface of the third lens element is concave; a periphery region of theimage-side surface of the fourth lens element is convex; an optical axisregion of the image-side surface of the sixth lens element is concave; aperiphery region of the image-side surface of the sixth lens element isconvex; the seventh lens element has positive refracting power; athickness of the first lens element along the optical axis a isrepresented by T1; a thickness of the sixth lens element along theoptical axis is represented by T6; a thickness of the seventh lenselement along the optical axis is represented by T7; a thickness of theeighth lens element along the optical axis is represented by T8; adistance between the image-side surface of the second lens element andthe object-side surface of the third lens element along the optical axisis represented by G23; a distance between the image-side surface of thethird lens element and the object-side surface of the fourth lenselement along the optical axis is represented by G34; a distance betweenthe image-side surface of the fourth lens element and the object-sidesurface of the fifth lens element along the optical axis is representedby G45; and the optical imaging lens satisfies inequalities:(T7+T8)/T6≤3.300;T1/T8≥1.200; and(G34+G45)/G23≤4.000.
 9. The optical imaging lens according to claim 8,wherein a thickness of the second lens element along the optical axis isrepresented by T2, a distance between the image-side surface of thefirst lens element and the object-side surface of the second lenselement along the optical axis is represented by G12, a distance betweenthe image-side surface of the sixth lens element and the object-sidesurface of the seventh lens element along the optical axis isrepresented by G67, a distance between the image-side surface of theseventh lens element and the object-side surface of the eighth lenselement along the optical axis is represented by G78, and the opticalimaging lens further satisfies an inequality:(T6+G67+T7+G78+T8)/(T1+G12+T2)≤2.200.
 10. The optical imaging lensaccording to claim 8, wherein a thickness of the third lens elementalong the optical axis is represented by T3, a thickness of the secondlens element along the optical axis is represented by T2, and theoptical imaging lens further satisfies an inequality:(T3 +G34)/(T2+G23)≤2.800.
 11. The optical imaging lens according toclaim 8, wherein a thickness of the second lens element along theoptical axis is represented by T2, and the optical imaging lens furthersatisfies an inequality: (T6+T7)/T2≤3.800.
 12. The optical imaging lensaccording to claim 8, wherein a distance from the object-side surface ofthe first lens element to an image plane along the optical axis isrepresented by TTL, a sum of thicknesses of the eight lens elements fromthe first lens element to the eighth lens element along the optical axisis represented by ALT, and the optical imaging lens further satisfies aninequality: TTL/ALT≤2.200.
 13. The optical imaging lens according toclaim 8, wherein a sum of seven air gaps from the first lens element tothe eighth lens elements along the optical axis is represented by AAG, adistance between the image-side surface of the first lens element andthe object-side surface of the second lens element along the opticalaxis is represented by G12, and the optical imaging lens furthersatisfies an inequality: AAG/(G12+G34)≥2.000.
 14. The optical imaginglens according to claim 8, wherein a distance between the image-sidesurface of the first lens element and the object-side surface of thesecond lens element along the optical axis is represented by G12, athickness of the second lens element along the optical axis isrepresented by T2, and the optical imaging lens further satisfies aninequality: T1/(G12+T2)≥1.300.
 15. An optical imaging lens comprising afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element sequentially from anobject side to an image side along an optical axis, each of the first,second, third, fourth, fifth, sixth, seventh and eighth lens elementshaving an object-side surface facing toward the object side and allowingimaging rays to pass through as well as an image-side surface facingtoward the image side and allowing the imaging rays to pass through, theoptical imaging lens comprises no other lens elements having refractingpower beyond the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements wherein: an optical axis region of the image-sidesurface of the first lens element is concave; a periphery region of theimage-side surface of the first lens element is concave; a peripheryregion of the object-side surface of the third lens element is concave;a periphery region of the image-side surface of the fourth lens elementis convex; the sixth lens element has negative refracting power; anoptical axis region of the image-side surface of the sixth lens elementis concave; a periphery region of the image-side surface of the sixthlens element is convex; a thickness of the first lens element along theoptical axis a is represented by T1; a thickness of the second lenselement along the optical axis is represented by T2; a thickness of thefifth lens element along the optical axis is represented by T5; athickness of the sixth lens element along the optical axis isrepresented by T6; a thickness of the seventh lens element along theoptical axis is represented by T7; a distance between the image-sidesurface of the first lens element and the object-side surface of thesecond lens element along the optical axis is represented by G12; adistance between the image-side surface of the fifth lens element andthe object-side surface of the sixth lens element along the optical axisis represented by G56; and the optical imaging lens satisfiesinequalities:(T6+T7)/T2≤3.800; and(T1+G12)/(T5+G56)≤2.200.
 16. The optical imaging lens according to claim15, wherein a thickness of the eighth lens element along the opticalaxis is represented by T8, and the optical imaging lens furthersatisfies an inequality: (T7+T8)/T6≤3.300.
 17. The optical imaging lensaccording to claim 15, wherein an effective focal length of the opticalimaging lens is represented by EFL, a sum of seven air gaps from thefirst lens element to the eighth lens elements along the optical axis isrepresented by AAG, and the optical imaging lens further satisfies aninequality: EFL/AAG≥2.200.
 18. The optical imaging lens according toclaim 15, wherein a distance between the image-side surface of thesecond lens element and the object-side surface of the third lenselement along the optical axis is represented by G23, a distance betweenthe image-side surface of the third lens element and the object-sidesurface of the fourth lens element along the optical axis is representedby G34, a distance between the image-side surface of the fourth lenselement and the object-side surface of the fifth lens element along theoptical axis is represented by G45, and the optical imaging lens furthersatisfies an inequality: (G34+G45)/G23≤4.000.
 19. The optical imaginglens according to claim 15, wherein a thickness of the third lenselement along the optical axis is represented by T3, a distance betweenthe image-side surface of the third lens element and the object-sidesurface of the fourth lens element along the optical axis is representedby G34, and the optical imaging lens further satisfies an inequality:(T1+T3)/G34≥1.500.
 20. The optical imaging lens according to claim 15,wherein a sum of thicknesses of the eight lens elements from the firstlens element to the eighth lens element along the optical axis isrepresented by ALT, a sum of seven air gaps from the first lens elementto the eighth lens elements along the optical axis is represented byAAG, and the optical imaging lens further satisfies an inequality:ALT/AAG≥1.600.